================================================================== BUG: KCSAN: data-race in __pagevec_lru_add_fn / do_tcp_sendpages write to 0xffffea0004ec7548 of 8 bytes by task 23056 on cpu 1: __list_add include/linux/list.h:73 [inline] list_add include/linux/list.h:88 [inline] lruvec_add_folio include/linux/mm_inline.h:102 [inline] __pagevec_lru_add_fn+0x2ae/0x380 mm/swap.c:1053 __pagevec_lru_add+0x1c3/0x270 mm/swap.c:1071 folio_add_lru+0x11a/0x160 mm/swap.c:469 filemap_add_folio+0xf8/0x150 mm/filemap.c:965 __filemap_get_folio+0x4c4/0x690 mm/filemap.c:2001 pagecache_get_page+0x26/0xe0 mm/folio-compat.c:125 grab_cache_page_write_begin+0x3f/0x50 mm/folio-compat.c:139 ext4_da_write_begin+0x292/0x4b0 fs/ext4/inode.c:2941 generic_perform_write+0x1c8/0x400 mm/filemap.c:3765 ext4_buffered_write_iter+0x19d/0x290 fs/ext4/file.c:268 ext4_file_write_iter+0x227/0xda0 call_write_iter include/linux/fs.h:2074 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x7f5/0x950 fs/read_write.c:590 ksys_write+0xd9/0x190 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffffea0004ec7548 of 8 bytes by task 23057 on cpu 0: page_is_pfmemalloc include/linux/mm.h:1773 [inline] __skb_fill_page_desc include/linux/skbuff.h:2258 [inline] skb_fill_page_desc include/linux/skbuff.h:2279 [inline] tcp_build_frag net/ipv4/tcp.c:982 [inline] do_tcp_sendpages+0xa52/0x13c0 net/ipv4/tcp.c:1039 tcp_sendpage_locked net/ipv4/tcp.c:1104 [inline] tcp_sendpage+0x89/0xb0 net/ipv4/tcp.c:1114 inet_sendpage+0x7f/0xc0 net/ipv4/af_inet.c:833 kernel_sendpage+0x187/0x200 net/socket.c:3492 sock_sendpage+0x5a/0x70 net/socket.c:1007 pipe_to_sendpage+0x128/0x160 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x207/0x500 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0x94/0xd0 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x675/0xc40 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000000 -> 0xffffea0004ec7508 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23057 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00418-gf8c7e4ede46f-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================